Damper and exhaust system that maintains constant air discharge

Details Damper and exhaust system that maintains constant air discharge Damper and exhaust system that maintains constant air discharge

1997-04-30

2000-06-06

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

251212, B08B 1502

Patent

active

060711884

ABSTRACT:
An exhaust system has an air exhaust duct having a charge opening and a discharge opening and defining an air flow path. A damper is mounted in the duct for maintaining a constant air velocity for air exiting the discharge opening. The damper has opposing damper blades pivotally mounted within the duct. Each damper blade has an end that is pivotally mounted in cantilevered fashion within the duct so that an opposing end is free to move within the duct. Each damper blade is parabolic in shape and minimizes the air turbulence over the damper blade and reduces vibration. Each damper blade can be pivoted in response to a change in air volume discharged through the discharge opening to maintain a desired velocity of air through the discharge opening.

REFERENCES:
patent: 1358854 (1920-11-01), Kendall
patent: 3517961 (1970-06-01), Shorrock
patent: 4207864 (1980-06-01), Fischer et al.
patent: 4269166 (1981-05-01), Worley et al.
patent: 4337892 (1982-07-01), Diermayer et al.
patent: 4608961 (1986-09-01), Lanham, Jr. et al.
patent: 4934256 (1990-06-01), Modd et al.

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